Henry davis and arthur henry stokes



2 sheets Sheet 1.

[nu/1km Patented June 9,1891.-

4 DAVIS & A. H. STOKES. GGMMUTATORFOR DYNAMO ELECTRIC GENERATORS AND MOTORS. No. 453,858.

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(No odel.)

2 Shets-She'et 2.

H. DAVIS. & A H. STOKES. YGOMMUYTAIOR PO 'D NAM ELECTRIC (No Mbdel.

MOTORS; Patented June 9,1891.

GENERATORS AND Queen of Great'Britain, residing at Derby, inthe county of Derby, England,haveinvent'ed To (ZZZ whomit may concern: Be it known that we, HENRYDDAVIS and 'UNiTED STATES PATENT Orrics,

- }I-IE.NR Y DAvis AND ARTHU' i-I NRY srouics, or nnunn nseLAN- COMMUTATOR FOR DYNAMO-ELECTRlC GENERATORS-AND.MOTORS.

SPECIFICATIONfoi-mingpart of Letters Putent Releases dated June 9, 1891. a licants-sea December 11,1890. seen No. 374,401. (no 5min.)

ARTHUR HENRY Sroxns, boths'ubjeets of the 2- an Improved Commutator for DynamosElec- :.t.ric Generators and Motors, ofwhich the fol-- llowingis a specification;

This inventioh relates to aconnnutator for dynamo-electric generators and motors in which the surrounding atmosphere-is ex;

- eluded from the commutator bars andbrushf es, so'thatwhen worki-ngin a gas-impreg- -neted atmosphere danger of-explosion from sparking will be avoided, and the brushes will be efiiciently protected from. thedaninging and disturbing effects of weather, dust; 850.; 1

. In the accompanying drawings, Figure 1 is partly aside elevation and pai'tlyalongitudi nal section ot a commutator embOdying'oflif. invention; and 'Fig.',2 an end view ther'eo f,' showing the means employed for; adjustingthe lead'of the brushes.

' A suitable method of carrying the invehtion into eifect consists in clamping the commutater-bars A between rings 0 D, which bear 4 on the ends of the bars, such rings being conryinge the brushes G, projects to the inside of:

fnected together by tie-burs B. The commutater-bars A'are insulated'from each other and from the rings 0 D. The inner clampingn'ng C is attached to or forms part of- & ,circular plate 0', which screws onto the conimutatonshaft M, while an end plate Escrews onto the outer ring Band has a central opens: ing through which a sleeve-cylinder K,'ca.r-

the commutator-ring. .This end plate E is preferably provided with. openings F, in

which horn, glass, pr, other transparent materiul is inserted, so as to form windows f0! enabling the commutator and brushes to be inspected during working whilepreventing the admission of gases or dust.

" The sleeve-cylinder K, carrying the brushes G, surrounds the commutator shaft M, with which it forms sloose but nearly tight-fitting joint at its ends, and the part outside the commutetor-ring is provided with aflange k;

which also forms a loose. but nearly tight-fitting joint against the outer surface of the end which such sleeve-cylinder projects to the inside of the coininutatonring The brushsholders J are carried by and insulated-from the sleeve-cylinder K, the latter being pierced with 'a hole or holes L from the brush es to the outside of the commutator-ring.-

forthe psssage'of the leads tothevbrushes.

The brushe's" G, carried in the holders J are forced outward.- by springs B, so as to bearaga st the inner surface *ofthe cylindrical ring formed by the commutator-bars A, a

bru shes in such movement;

'lhe'sl'eev'e-cy linder K; carryingthe brush holders J, hasarms-O projecting from its outer end, such arms serving to regulate the lead-bf-thc-brnshes by adjusting the ends or such arms within braokets P, which they engage, (thereby shifting the sleere-eylinder round the shaft,) and then by means oi. clamp ing screws N securing such such arms in the position to which they have been adjusted.

Byunse'rewing' the end plate E from the outer' clampin g-rin g D fand releasing the ends of the arms 0 of the- -sl'eeve-cylinder K from thebrackets P they engage, the sleeve-cylinpin-and-slot connections serving to guide the tier K can-be slid along: the shaft, thus dra-wing out the brushes G from the inside of the commutator-ring when required for cleaning or repairing the same, a sufiicientspaee be ing letflbetween the end plate E and the end bearing Q of the commutator-"shaft M to enab le this to be eifected. 'As the end plate E is secured to the ring D of the commute-tor and revolves with it,,and the brushes cannot "be removed until'the plete E is unfastened fromrsuch ring, it will be seen that this cannot be effected while the machine is running; and,

furthe'ig it will be seen that the piste 'E must Ibeagain secured tothe ring 1) before the machine can be again run. It therefiire follows that the commutator and brushes cannot be exposed or opened to the atmosphere while the motor is running, and all chance of an explosion occurring is consequently avoided It required, binding'wires or strips V, insulate from the commutator-bars A, may be wound outside the ring of such bars, so as to give greater stability to such ring.

- What we claim as our invention, and desire tosecure by Letters Patent, -is'--.

. 1. The-i: np1-oved commutator, consisting of v-, a set'of ink-elated commutator-bars arranged inthe fox-mot a cylindrical ring closed at both ends, and of brushes bearing'against the inn.

' 5 ner surface of such ring and carried by a sleeve projecting through an 'ope'uingin the "plate closing the outer-end-of the ring, the

sleeve passing through the outerplate, so that it can be tumedin relation thereto and 'yetreform a flame-tight; and dust-tight'joint as the opening through which {it passes, siibstam 'f nllyas ldese ribe'al" I The combination of acommuthtt-shft, acoinmi' tator-cylinder supported thereon, 'a I5 sleeve on said shaft within 'SR-ldICYHHdEX brushes supported onset-id sleeve and bearing against the inner surface'of the com mhtatorcylinder, an: arm'projecting from said sleeve outside said eyliiiderfand 'a'braeket engaged 20, by said ai ing substantially as described.

3. The colxibiiiation-of a conimutatobshaft;

a coimnutat'or-cylinde supported thereon, a v sleeve on s' iid shaft withii'1"sai'd .cylin er, brushessupported on, saidsleevejaud beef ng 2 5 against the inner surface oithec'ommu'tetorcylinder", an arm 'projeeting'fromsaiqlsleeve outside said cylinder; in braeket eugaged by said arm, and means forar lj usting said arm on said bracket, substantially as described.

4. The combinatioiiof a commutator-shaft,

'wi-t iiessesz a commutator-cylinder supported thereon, slidingsleeve on' said shaft within said eyiiw den, brushes supported on said sleeve for 0011 met with the inner surface lit-the cylin iier, and plates closing the ends of .aaiil cylinder, one of said plates being etaeheble, substantially as described.

'5. T he combination, with a eylim'iricelrizzg of insulated commutator-bars, analbrushes which bear on the inner surface of eueh. ring of'bers, of end plates to close the ends of suoh *itfi gtsmismmnyes mu mth'e' "purpose- 6. The eombinatiom-wiih the ring of ec-mmutator 'bars A andthe sleeve K,,,ee.i-rying brushes; G, bearing on the inner surface :of such ring, of arms 0, projecting. from such sleeve'K outside the'ringot commutator-hers and engaging brackets P, their positioas ii such brackets being adjustable, so as to regulate the lead-oi specified-r the brushes, substantially as HENRY DAVIS. i r I ART-HUB, HENRY STOKES.

'l. M. WINS'IAINLEY WALLIS,

' ,-Derby, Engineer.

W LLIAM HY.,EvA1-;s,

- 49 Wild SA, Derby, Clerk. 

